Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Amortized cost
Due in one year or less	$ 6,293
Due after one year through five years	59,775
Due after five year through ten years	33,889
Due after ten years	1,141
Total	101,098
Asset-backed securities	120,106
Total available for sale securities	221,204
Fair value
Due in one year or less	6,352
Due after one year through five years	60,297
Due after five year through ten years	33,480
Due after ten years	1,083
Total	101,212
Asset-backed securities	119,443
Fair value, Total	$ 220,655	$ 200,246